Roof hook



Patented July 21, 1925,

LYNNE.

EDGAR M, DENNISTON, OI? BURiJiNGTON, IOWA.

noon I-IbOK.

Application filed January 2, i925. Serial N0. 150.

To all whom it may concern:

l te it known that I, EDGAR M. DENNISTON, a citizen of the United States, and a resident of Burlington, in the county of Des 5 Moines and @tate of Iowan-have made a certain new and useful Invention in Roof Hooks; and I declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains to make and use the invention, reference being); had to the accompanying drawings, and to letters or figures of reference marked thereon,

which form a part of this specification.

Figure 1 is a side view of the invention as applied.

Figure 2- is a sirnilarview on a larger scale showing a different adjustment.

Figure 8 is an end view of the invention.

folded.

Figure 11 is an edge view of the same.

Figure 12 is a plan view of the form of the invention shown in Figure 9.

Figure 13 is a fragmentary detail side view of the same.

Figure 14 is a side view of another modification of the invention.

Fiirure 15 is a side yiew of another modification.

The invention has relation to roof hooks, for painters and others working; upon the sides of buildings, and used for the attachment of hoisting); ropes for the platforms upon which the workmen. are supported. the object being, to provide an improved device for this purpose.

The invention consists in the novel construction and combinations of parts, as hereinafter set-forth.

in the accompanyingdrawinpgs illustrating; the invention, the numeral 2 designates the ilk .tensplatform and 3 the hoisting ropes Figure 4 is a side view of the invention Figure 10 is a side view of the same .in g's the roof hook is shown as formed with upper and lower parallel arms or sections 5 and 6, and a vertical connecting arm or section 7, the upper arm having at its inner free end the hook 8, and the lower arm having at its inner free end the pulley block 4;, the vertical connecting arm .7 being located at the outer ends of said upper and lower arms out of the way of the building cornice or other projection.

The sections or arms 5, 6, and 7. aremade of light steel bars. it being; preferred that the arms shall be foldable to enable the deto this end said arms 'are pivotally connected at 9 and '10, corner stops formed of lugs bent integrally of the metal of the arms being shown at 11, and serving to limit the openinginovement of the arms from folded position.

The lugs 11 are preferably bent outwardly in opposite directions and the upper and lower arms 5 and 6 are located upon opposite sides of the upright arm 7, as best shown in Figure 2 to facilitate the folding of the device, the three arms or barsbeing in this way foldable into coinpact parallel relation for placing in a tool box or vehicle.

In order to make the device of the proper strength to bear the loads to which it is subjected, a slidable upright tie bar 14- is slid over the ends of the upper and lower arms 5 and 6 with the upper and lower oppositely bent or looped ends 15 thereof engaging said upper and lower arms, said tie bar being" preferably of double curved form, in order to avoid contact with the building cornice or other projection. The tie bar is slid towards the vertical wall of the building as near as possible in order to transmit the strain of the load from the hook 8 to the block and tackle suspension device for the workmens platform as directly as possible, the strain of the load being transmitted from the hook 8 through the tie bar to said block and tackle. with no strain upon the upright arm 7 of thedevice. The tie bar 14 has bolts 14 connecting; the branches of the upper and lower looped ends thereof, said bolts contacting with the inner longitudinal edges v of the upper and lower arms 5 and 6to resist folding of the same upon the pivots 9 and 10.

In using the device upon a building havingno cornice, in which case it is necessary to extend the hook 8 beyond the vertical wall of the building, the lower arm or bar 6 may be set back or adjusted suitably to admit of the desired extension of the said hook of the upper arm, this being provided for by a horizontal series of perforations 10 in the lower arm or bar 6, with any one of which the bolt 10 is adapted to engage. In this case, the workmens platform is suspended from "a slidable hook 16 engaging the lower bar 6 and adjusted 'to proper position thereon. i

In this case also, the lower arm or bar 6, which is preferably provided with a downturned inner or hooked free end 6'.- will bear against'the vertical wall ofithe building, as best shown in Figure 1 or may do so, the block and tackle being suspended from an eye of the hook 6'. V

' The upperarm or bar '5 is provided withv a horizontal series of'perforations 9' engageable by the pivot bolt 9 in adjusting the ef fective length thereof.

In case it is desired to shorten the effective lengths of thearm 7 and of the tie bar 14, as best shown in Figure 5, the upper and lower arms 5 and 6 are changed over to the sides of the upright arm 7 opposite to the sides thereof upon which they are normally located, and the arm 7 is provided at its upper and lower ends each with two perforations? with the inner of which the bolts 9 and 10 are engaged (said bolts being normally engaged "with the outer of said perforations) and the tie bar '14 is provided at its upper and lower looped ends 15 each with two perforations 15, with the inner of which the bolts 14 are engagedfsdd bolts being-normally engaged with the outer of said perforations). Lug bolts 17 project laterally ofthe arm 7 upon opposite sides thereof, being ens aged bv the arms 5 and 6 s l 3 r 1 to limit the outer or unfolding movement thereof. The lug bolt 17 at theupperend of the arm 7 projects laterally oppositely to the projection ofthe upper bent lug 11,'and the lug bolt 17 at the lower end of the-arm 7 projects laterally oppositely to the projectionof the'lo wer bent lug'11;in'order to enabl'ethe'upper and lower-arms 5' and '6' to be folded in the normal location thereof shown in Figure 2.

i A modification of the invention'is shown in' Figures are 13 inclusive wherein similar 7 parts are characterized by the same refer ence'numerals diifer'entiatedby the exponent 8' 'is rive' ted to the upper arm of the device,

5 :and litre-not adjustable, and the'corner stops ll are structurally .difl erent,, and the I nent X In-this modification the hook proper downturned inner hooked free end of the lower bar (5 is lacking.

ianother modification is shown in Figure wherein similar parts have similar referrnaracters.diiierentiated by the expoc y and wherein corner braces 12 con- "eating the arms 5, 6, and 7 are detachable rercfrom by the removal of the connection )(7. tslfi.

Another modilication is shown in Figure 15 wherein similar parts have similar reference characters dinerentiated by the ezipoz except that the eye at the lower side of the device has the reference character. 6, and wherein the device is bent up into form from rod metal, the tie bar l4: when slid inwardly adding the necessary strength.

I claim i i q '1. A roof hook having upper and lower parallel arms, an upright connecting arm at-the outer end thereof, and a tie bar conmeeting said upper and lower armsv interniediatelyv of the length thereof and acting to transmit the strain of the load more directly and toaelieve said connecting arm of strain; f

2. A roof hook having upper and lower parallel arms,-an' upright'connecting arm at the outer endtherecf, and. a tie bar connect ingsaid upper and lower arms intermediately of the "length thereof and adjustable thereon.

8. A roof hook, having'upper and lower parallel arms, an upright'connecting arm at the outer endthereofyand a tie bar connectsaid upper andlower arms intermediatelyof the length thereof and of double curved form. v

4. A roofhook having upper and-lower parallel arms, an upright connecting arm at the outer end thereof, and a tie bar connectinn said upper and lower arms intermediately of the lengththereof, said upper and lower arms and the connecting armbeing pivotally connected and foldable into com pact form'and saidtie bar being detachable therefrom. 1 1 i Aq oof hook having upper'and lower parallel arms, an upright'connecting arm at the-outerend thereof; and a tie bar connecting said upper and lower arms intermedi-' ately of the length thereof, said upper and lower and connecting-arms beingpivotally connected and foldab'le into compact form and said tie-bar being detachable therefrom, the upper and lower" arms being disposed upon opposite sides -of said connecting arm,

ing said upper and lower arms intermediately of the length thereof, the connection of the upper and lower arms with the con necting arm being adjustable to adjust the ellective height 01 the device, and the tie bar having adjustable connection with the upper and lower arms for the same purpose 7. A roof hook having upper and lower parallel arms, an upright connecting arm at the outer end thereof, and a tie bar connecting said upper and lower arins intern'iediately ol the length thereof, the connection of the upper and lower arms with the connecting arin heing adjustable to adjust the et- 15 fective height of the device and the effective heing adjustable to shorten the ellective length of the lower arm, and an adjustable suspension devlce upon sald lower arm.

in testimony whereot l alrlx my signature.

EDGAR M. DENNISTON.

All 

